How do I detect a change of tab page in TabControl prior to SelectedIndexChanged event?

Posted by JYelton on Stack Overflow See other posts from Stack Overflow or by JYelton
Published on 2010-05-28T02:05:32Z Indexed on 2010/05/28 2:11 UTC
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winforms

I currently determine what page of a tabcontrol was clicked on via the SelectedIndexChanged event.

I would like to detect before the selected index actually changes, for validation purposes. For example, a user clicks a tab page other than the one they are viewing. A dialog is presented if form data is unsaved and asks if it's ok to proceed. If the user clicks no, I'd like to remain on the current tab.

Currently I have to remember the previous tab page and switch back to it after an answer of 'no.'

I considered MouseDown (and the assorted calculation logic), but I doubt that's the best way.

(This is in .NET C# 3.5)

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